import * as types from './mutation-types'
import {playMode} from 'common/js/config'
import { shuffle } from "common/js/util";
import {saveSearch} from 'common/js/cache'
import { deleteSearch, clearSearch, savePlay, saveFavorite, deleteFavorite } from '../common/js/cache';


function findIndex(list, song) {
  return list.findIndex((item) => {
    return item.id === song.id
  })
}

export const selectPlay = function({commit, state}, {list, index,random}) {
  if(random) {
    commit(types.SET_PLAY_MODE, playMode.random)
  }
  commit(types.SET_SEQUENCE_LIST, list)
  commit(types.SET_PLAYLIST, list)
  commit(types.SET_CURRENT_INDEX, index)
  commit(types.SET_FULL_SCREEN, true)
  commit(types.SET_PLAYING_STATE, true)
}

export const insertSong = function({commit, state}, song) {
  let playlist = state.playlist.slice()
  let sequenceList = state.sequenceList.slice()
  let currentIndex = state.currentIndex
  //记录当前歌曲
  let currentSong = playlist[currentIndex]
  //查找当前列表中是否有待插入的歌曲并返回其索引
  let fpIndex = findIndex(playlist, song)
  //因为是插入歌曲 所有索引要加一
  currentIndex++
  //插入这首歌到当前位置
  playlist.splice(currentIndex, 0, song)
  //如果已经包含这首歌
  if(fpIndex > -1) {
    //如果当前插入的序号大于列表中的序号
    if(currentIndex > fpIndex) {
      playlist.splice(fpIndex, 1)
      currentIndex--
    } else {
      playlist.splice(fpIndex + 1, 1)
    }
  }


  let currentSIndex = findIndex(sequenceList, currentSong) + 1

  let fsIndex = findIndex(sequenceList, song)

  sequenceList.splice(currentSIndex, 0, song)

  if (fsIndex > -1) {
    if (currentSIndex > fsIndex) {
      sequenceList.splice(fsIndex, 1)
    } else {
      sequenceList.splice(fsIndex + 1, 1)
    }
  }

  commit(types.SET_PLAYLIST, playlist)
  commit(types.SET_SEQUENCE_LIST, sequenceList)
  commit(types.SET_CURRENT_INDEX, currentIndex)
  commit(types.SET_FULL_SCREEN, true)
  commit(types.SET_PLAYING_STATE, true)
}

export const saveSearchHistory = function({commit}, query) {
  commit(types.SET_SEARCH_HISTORY, saveSearch(query)) 
}

export const deleteSearchHistory = function ({commit}, query) {
  commit(types.SET_SEARCH_HISTORY, deleteSearch(query))
}

export const clearSearchHistory = function ({commit}, query) {
  commit(types.SET_SEARCH_HISTORY, clearSearch())
}

export const deleteSong = function ({commit, state}, song) {
  let playlist = state.playlist.slice()
  let sequenceList = state.sequenceList.slice() 
  let currentIndex = state.currentIndex
  let pIndex = findIndex(playlist, song)
  playlist.splice(pIndex, 1)
  let sIndex = findIndex(sequenceList, song)
  sequenceList.splice(sIndex, 1) 
  
  if(currentIndex > pIndex || currentIndex === playlist.length) {
    currentIndex--
  }

  commit(types.SET_PLAYLIST, playlist)
  commit(types.SET_SEQUENCE_LIST, sequenceList)
  commit(types.SET_CURRENT_INDEX, currentIndex)

  const playingState = playlist.length > 0

  commit(types.SET_PLAYING_STATE, playingState)

}
export const deleteSongList = function ({commit}) {
  commit(types.SET_PLAYLIST, [])
  commit(types.SET_SEQUENCE_LIST, [])
  commit(types.SET_CURRENT_INDEX, -1)
  commit(types.SET_PLAYING_STATE, false)
   
}

export const savePlayHistory = function ({commit}, song) {
  commit(types.SET_PLAY_HISTORY, savePlay(song))
}

export const saveFavoriteList = function ({commit}, song) {
  commit(types.SET_FAVORITE_LIST, saveFavorite(song))
}

export const deleteFavoriteList = function({commit}, song) {
  commit(types.SET_FAVORITE_LIST, deleteFavorite(song))
}